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Re: Triple boot:XP,ubuntu&FC5 grub failed



Tod Merley wrote:
On 9/6/06, Mike McCarty <Mike McCarty sbcglobal net> wrote:
Tod Merley wrote:
> Hi Gayal Rupasinghe and Jim Cornette!
>
> Gayle, Jim has it pretty much right I think.
>
> The chainload of Ubuntu (sort of a "stop looking here and start fresh
> right there!) should see a Fresh MBR (this is were I have a bit of a
> question since I can only see an MBR as being generated for the first
> sector of the disk) immediately followed (and referenced in the MBR)
> by a file within your current /boot/grub called "reiserfs_stage1_5".

[snip]

Erm...

There is exactly one (1) MBR per physical fixed disc. Each non-extended
partition has a BR on it (sometimes called the geometry). GRUB
can run either from the MBR or from a BR. Extended partitions are
another story altogether.

Mike
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Hi Mike McCarty!

So when you use a GRUB prompt or grub-install you can form a Boot
Record on any of the four Primary Partitions (the very first one being
the Master Boot Record of course)?

How do you make sure it is formed for the partition and knows were the
proper stage 1.5, stage 2, and grub.conf or menu.lst are?

Thanks!

Tod


Lokking through the replies, I did not see mention of what installs the basics for the bootloader.

When you run grub-install /dev/hdx# from any of your installations, information is installed for grub to finis booting. So when you install grub into /dev/hdb2 for example, information for grub and the first stage is chainloaded. (given over control to the particular OSes version of grub.) From there, it loads the consecutive stages in a similar way that installing grub into the MBR does. If grub is not installed into the MBR, the partition where you installed grub into must be marked as active. BIOS will take it from there to start grub from a partition where it is installed, consecutively going through the various stages grub goes through in order to load the OS.

Jim

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